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SELECT m, MAX(maxDateTime) AS latest
FROM (select m1 as m, max(dateTime) as maxDateTime
from journal
group by m1
union
select m2 as m, max(dateTime) as maxDateTime
from journal
group by m2 ) AS u
left join journal on u.latest=journal.time
GROUP BY m

yeah, you're right, you didn't do it correctly, i am sorry, i thought you did but you didn't

your join should look like this --

Code:

FROM (
SELECT m, MAX(maxDateTime) AS latest
FROM (
select m1 as m, max(dateTime) as maxDateTime
from journal
group by m1
union
select m2 as m, max(dateTime) as maxDateTime
from journal
group by m2
) AS u
GROUP BY m
) AS d
INNER
JOIN ...

select m, latest
(SELECT m, MAX(maxDateTime) AS latest
FROM (select m1 as m, max(dateTime) as maxDateTime
from journal
group by m1
union
select m2 as m, max(dateTime) as maxDateTime
from journal
group by m2 ) AS u
GROUP BY m ) as d
inner join journal on u.latest=journal.time